Secondary clock



Oct. 15, 1929, WEBB L732J46 SECONDARY cLocK Filed Nov. 2.; 1925 4 NaderclocK 35 J9 will} 7 3y 4 l lllllllllll 36 Jzm asA FZZ Patented Oct. 15,1929 PATENT OFFICE JAMES A. WEBB, OF CORPUS CHRISTI, TEXAS SECONDARYCLOCK Application fl led November 2, 1925. Serial No. 66,320.

My present invention has reference to a secondary clock designed to beoperated in timed relation with a master clock, the improvement beingespecially adaptable for use in connection with moving picture machines,whereby a projecting machine in one moving picture theatre may beoperated in proper timed relation with respect to that in another movingpicture theatre.

To the attainment of the foregoing the invention consists in theimprovement as hereinafter described and definitely claimed.

In the drawing I have illustrated a diagrammatic view of my improvement.

In the drawing a master clock is broadly indicated by the numeral 21. Asthe same works are employed in this clock as in those or ordinaryconstructions, a detail description thereof will not be entered into. Aspring turned wheel 22 revolves another wheel 23. This Wheel 23 may beformed on one of the faces of a larger toothed wheel 33. Between theteeth of the wheel 33 there are inserted insulator blocks 34. Designedfor intermittently contacting with the metal teeth of the wheel 33 andthe insulator blocks 34 there is a spring armature or finger 35. To thisspring finger or armature 35 there is attached a conductor Wire 35 andto the shaft 23 for the wheels 23 and 33 there is attached a secondconductor wire 33. Both of these conductors are in circuit with abattery 34 and both of these wires 35 and 33 are connected to anelectro-magnet 36.

The secondary clock is broadly indicated by the numeral 14 and the sameis operated by the master clock in a manner which will now be described.

The core of the magnet 36 attracts and releases the metal arm 37 of thepallets 38 for the escapement wheel 39 of the secondary clock 14. Fixedon the shaft 39' of the escapement wheel 39 there is a pinion 50, andthis pinion is in mesh with a larger pinion 51 that is journaled on ashaft 44. Fixed on one side of the pinion 51 or to the shaft 44 there isa ratchet wheel 45 and mounted for turning on the shaft 44 there is ametal bell crank lever 43. On one of the arms of the bell crank lever 43there is pivotally connected a pawl 46 which engages with the teeth ofthe ratchet wheel 45. The numeral 42 designates an electro-magnetdisposed opposite the second arm of the metal bell crank lever 43. Thiselectro-magnet 42 is in circuit with a suitable battery and has one ofits conductor wires connected to the pivot for the arm 37 and its secondconductor wire secured to a contact element 41 which is disposedopposite a spring finger 40 that is secured on one side of the arm 43.

The toothed wheel comprising the circuit breaker 33 will, upon therotation thereof, and as previously stated, make and break the circuitto the electro-magnet 36, the said electro-magnet 36 when energizedattracts the arm 37 of the pallets 38 to bring one of said pallets outof engagement with one of the teeth of the escapement wheel 39 and thesecond arm in the path of engagement with another tooth. This movementbrings the contact 40 into engagement with the contact 49, completingthe second electric circuit and energizing the electro-magnet 42 whichattracts the bell crank lever 43 and causes the pawl 46 to turn theratchet wheel 45, and consequently turn the gear train of the auxiliaryclock 14 for a predetermined distance. The two armatures are returned toinitial position when the circuit is broken by ordinary means employedfor this purpose, such as a spring cooperating with a fixed stop.

Having described the invention, I claim In a device for the purpose setforth, the combination with an electric circuit which includes anelectro-magnet and means for intermittently energizing the circuit attimed intervals, of a clock designed to be actuated by the circuit, saidclock having a revoluble toothed wheel, an escapement wheel rotated bythe turning of the toothed wheel, a pivoted metal arm having pallets toengage with the teeth of the escapement wheel, disposed in closeproximity and designed to be attracted by the mentioned electromagnet, abell crank lever pivoted on the shaft of the toothed wheel and having apivoted pawl to engage with the teeth thereof, a battery circuit havingan electro-magnet therein disposed opposite and designed to attract onearm of the bell crank lever, one of the Wires of the said circuit beingconnected to the pivot of the metal arm, a spring finger comprising acontact on the pallet carrying arm and the second Wire of the circuithaving a contact to be engaged by the spring finger when the pallet armis attracted by the first mentioned electro-magnet.

In testimony whereof I affiX my signature.

JAMES A. WEBB.

